DIY Float Switch

[cmantis]

I want to wire up a float switch to fill my top off container so I don't overfill as it will be remote. I plan to splice a float switch into an extension cord. Do I need a 12v dpdt relay or will it work without?

 

[Paul B]

Yes you definately need a 12 volt power supply or transformer. Float switches are low voltage and you really don't want line voltage going into your top off container.
(electrician 40 years)

 

[cmantis]

Many of the youtube videos show just splicing into an extension cord...

Mind sharing a link to a part or diagram to help me conceptualize a bit better?

 

[Paul B]

I made mine from an old thermostat, I used the mercury switch in the thermostat to control it but it would be a little complicated to explain

 

[vio]

Many of the youtube videos show just splicing into an extension cord...

Mind sharing a link to a part or diagram to help me conceptualize a bit better?

I use those for more than 10 years.
#1 buy Madison made in USA (e-bay is just garbage)
#2 you need the probe , no matter what.
I use Rio 600 for last 5-6 years still good, make sure you got NO snails,starfish etc. in your sump, will block the switch .
http://www.saltysupply.com/Ground-C...RC3jrb24JjE8VgSJAAyIzAdkYRBp6-EbcnV5YKLaYjyqe
http://www.zoro.com/i/G2923024/?utm...Shopping_Feed&gclid=CjwKEAjw0q2pBRC3jrb24JjE8
Lowe'r store have the 1/8 NPT tap for $ 3-4, use some Acrylic (bend by using the stove).

 

[reefoman]

Float switches are low or high voltage (your choice) but for safety you should go with low voltage.
Don't buy a cheap ebay solenoid valve, I can recommend redhat company for heavy duty industrial solenoids that never fail for me or my customers.
It's $50 solenoid you can trust years.
I bought many cheap ones and some of them leak.
Only my 2 cents...

 

[ReefNut]

I dug up an old thread on RC that helped me many years ago.
Maybe it will help.
http://www.reefcentral.com/forums/showthread.php?t=815859